@article{ZurellJeltschDormannetal.2009, author = {Zurell, Damaris and Jeltsch, Florian and Dormann, Carsten F. and Schr{\"o}der-Esselbach, Boris}, title = {Static species distribution models in dynamically changing systems : how good can predictions really be?}, issn = {0906-7590}, doi = {10.1111/j.1600-0587.2009.05810.x}, year = {2009}, abstract = {SDM performance varied for different range dynamics. Prediction accuracies decreased when abrupt range shifts occurred as species were outpaced by the rate of climate change, and increased again when a new equilibrium situation was realised. When ranges contracted, prediction accuracies increased as the absences were predicted well. Far- dispersing species were faster in tracking climate change, and were predicted more accurately by SDMs than short- dispersing species. BRTs mostly outperformed GLMs. The presence of a predator, and the inclusion of its incidence as an environmental predictor, made BRTs and GLMs perform similarly. Results are discussed in light of other studies dealing with effects of ecological traits and processes on SDM performance. Perspectives are given on further advancements of SDMs and for possible interfaces with more mechanistic approaches in order to improve predictions under environmental change.}, language = {en} } @phdthesis{Zinck2009, author = {Zinck, Richard}, title = {Diversity, criticality and disturbance in wildfire ecosystems}, address = {Potsdam}, pages = {97 S.}, year = {2009}, language = {en} } @article{ZhangHubalewskaIgnatova2009, author = {Zhang, Gong and Hubalewska, Magdalena and Ignatova, Zoya}, title = {Transient ribosomal attenuation coordinates protein synthesis and co-translational folding}, issn = {1545-9985}, doi = {10.1038/Nsmb.1554}, year = {2009}, abstract = {Clustered codons that pair to low-abundance tRNA isoacceptors can form slow-translating regions in the mRNA and cause transient ribosomal arrest. We report that folding efficiency of the Escherichia coli multidomain protein Sufl can be severely perturbed by alterations in ribosome-mediated translational attenuation. Such alterations were achieved by global acceleration of the translation rate with tRNA excess in vitro or by synonymous substitutions to codons with highly abundant tRNAs both in vitro and in vivo. Conversely, the global slow-down of the translation rate modulated by low temperature suppresses the deleterious effect of the altered translational attenuation pattern. We propose that local discontinuous translation temporally separates the translation of segments of the peptide chain and actively coordinates their co-translational folding.}, language = {en} } @phdthesis{Zhang2009, author = {Zhang, Gong}, title = {Transient ribosomal attenuation as a generic mechanism to coordinate protein biosynthesis and biogenesis}, address = {Potsdam}, pages = {114 S.}, year = {2009}, language = {en} } @phdthesis{Zbierzak2009, author = {Zbierzak, Anna Maria}, title = {Isolation and characterization of the chilling sensitive 1 gene from Arabidopsis}, address = {Potsdam}, pages = {iii, 131 Bl. : Ill., graph. Darst.}, year = {2009}, language = {en} } @phdthesis{Yazdanbakhsh2009, author = {Yazdanbakhsh, Nima}, title = {Development of a robotized image processing platform to decipher root elongation kinetics in a. thaliana and investigating the role of carbohydrates and the circadian clock genes in detected diurnal patterns}, address = {Potsdam}, pages = {97 S. : Ill., graph. Darst.}, year = {2009}, language = {en} } @phdthesis{Yadav2009, author = {Yadav, Umesh Prasad}, title = {Sucrose and trehalose-6-phosphate signalling in "Arabidopsis thaliana"}, address = {Potsdam}, pages = {X, 156 S. : zahlr. graph. Darst.}, year = {2009}, language = {en} } @article{WronskiApioPlathetal.2009, author = {Wronski, Torsten and Apio, Ann and Plath, Martin and Averbeck, Christiane}, title = {Do ecotypes of bushbuck differ in grouping patterns?}, issn = {0873-9749}, doi = {10.1007/s10211-009-0058-5}, year = {2009}, abstract = {Grouping patterns within the genus Tragelaphus suggest that species inhabiting open areas tend to live in larger groups, while species preferring dense habitats live solitarily or in small family groups. We asked if similar variation would be concealed in the within-species variation of bushbuck (Tragelaphus scriptus). Recent molecular phylogeographic analyses revealed several locally adapted forms of bushbuck in different ecoregions on the African continent. We compared group sizes of south-eastern bushbuck (Tragelaphus sylvaticus) among six different populations ("ecotypes"). To date, most data on the social organization of bushbuck have been collected from only one population in Queen Elizabeth National Park (QENP) in Uganda. This particular population, however, inhabits an unusual-comparatively open-habitat type, while bushbuck otherwise inhabit dense habitats, leaving doubt whether data collected in QENP are representative of the entire species. We, therefore, compared grouping patterns between ecotypes inhabiting rather open habitats (e.g., dianae and haywoodi) and ecotypes occupying rather dense habitats (e.g., massaicus and ornatus). In bachelor groups and in all-female (spinster) groups, single sightings were the most frequent "group type" in all populations examined. We detected no significant difference among ecotypes in relative frequencies of group size categories in the case of bachelor groups. Spinster group sizes were slightly (albeit significantly) smaller in QENP than in all other areas. Moreover, a comparison of two areas inside (low human pursuit) and outside Lake Mburo National Park (high hunting pressure) in Uganda revealed no significant difference in grouping patterns in response to human pursuit (as reported for impala [Aepyceros melampus] inhabiting the same area). Altogether, our results suggest that group sizes in bushbuck are not dependent on the habitat type they inhabit; neither does human nuisance have an impact on grouping patterns. Hence, an "almost solitary" lifestyle appears to be a characteristic of the entire taxon.}, language = {en} } @article{WronskiApioPlath2009, author = {Wronski, Torsten and Apio, Ann and Plath, Martin}, title = {Absence of a dominance hierarchy confirms territorial organization in male bushbuck (Tragelaphus scriptus Pallas, 1766)}, issn = {0141-6707}, doi = {10.1111/j.1365-2028.2007.00876.x}, year = {2009}, abstract = {It has been suggested that all species of spiral-horned antelopes (Tragelaphini) lack territoriality. Furthermore, some authors suggested that bushbuck (Tragelpahus scriptus) males form dominance hierarchies. In this study, we investigated the dominance relationships in two groups of free-ranging bushbuck males in Queen Elizabeth National Park, Uganda. Adult males dominated young-adult bachelors and subadult males, but no distinct dominance relationships were found among adult males. Landau's index of linearity revealed no linear dominance hierarchy in the study populations. Our results support the idea that adult males are territorial, and overt aggression is directed almost exclusively towards bachelors that challenge territory holders.}, language = {en} } @article{WonkeWallschlaeger2009, author = {Wonke, Gundula and Wallschl{\"a}ger, Hans-Dieter}, title = {Song dialects in the yellowhammer Emberiza citrinella : bioacoustic variation between and within dialects}, issn = {0021-8375}, doi = {10.1007/s10336-008-0326-6}, year = {2009}, abstract = {The yellowhammer Emberiza citrinella is a common European bird that sings in dialects that for decades have been distinguished by the existence of one single element (called a "specific''). In this study we looked into other possibilities for dialect discrimination, measuring 24 different variables. For the first time, multivariate statistics were used to discriminate dialect in yellowhammer song. Two similar dialects (XlB and XsB) that are not clearly defined in the literature were studied. Statistics incorporated (1) all variables, ( 2) no variables of "specific'' elements, and (3) no variables under the influence of these "specific'' variables. Multivariate statistics support dialect discrimination by ear and confirmed that only one element in yellowhammer song characterises dialect. In addition, we looked for local differences within two dialects and found that one local observation area showed a higher separation than the other sites (Meck1). However, as yet there is insufficient evidence for the existence of a new subdialect.}, language = {en} }